1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88349b6d582462c3b4c3923430bb882fdf7b99bbe4ec4ad9c2eb3b55a5cf442. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12f8f33b-6511-47e3-bc93-b9a01ebd0fe5.json and https://artists.proofprofile.net/proofs/artist/12f8f33b-6511-47e3-bc93-b9a01ebd0fe5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ef50cc73668a8e9324e7e699784730c064cce867601164a2e2f4e6ab26398b. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0c15ff9bef471afdcd0c3e510d2a84b44613caddb82ce51df02af2ebf859e1. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8093b4402bc637e0e13afd47468e8b8ec275123d8c7de25b5d800be9254ded8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc532799b21eacd0dc93c69a7d689348b0bf24a31eb1457dfe84221569b7810a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d4ed7cdd4017b6c6ba113c67f46111958f632a4d1848abed79d2174c9648fc. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2207500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbb3cbf99250e856c2538e800702eb20f57f02597d66adee2f20b9bcbb18bf2. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297c93e0785948ea5f6151337a20d69e0bdc6abf6d6f578c3c514f92dc0b9bb5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92346623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcf473af66c7692344332e1de8a38c37899bd0ebaa23cdf6e9c8397847c47ba. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92484570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573852dd1b92d55ccb6e6da9399dcabb9220a171205f366a5fb4ace92fd3b343. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92484568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ff28e824621a7b6ce19f2d53b7cfb2830c0ec2e5bf29a45155f03d6ed52fe9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92484569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55eef68868a303486498a7d76779e92e7cc39f4bed2aec4bc43d57767b4dd288. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92484571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1656338d53637dede2bd062d457d5aa1528c6e504a1af4c782f29d810f4d929. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92484574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bd446691563c8a6e3e55f9ad6638f2872285b5ce973fd40c244ad099bde55a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6P42552590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bea30b1d435e8f212d08645b21f421eeae03470d3314aa58508718a2aa9965a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6P42552591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c874e7982f7679e74006215a3d11838b6cb1524946db887531fe6c4f8a8c68b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6P42552593.